For the 2017 Lincoln MKZ, headlight bulb fitment depends on the factory headlight system. Models with HID headlights use a D3S bulb for both the low-beam and high-beam functions. Models equipped with LED headlights use integrated LED lighting for both low and high beams instead, so the two configurations are not interchangeable.
The remaining listed lighting functions are LED-equipped, including the front and rear turn signals, brake and center high-mount stop lights, reverse lights, tail lights, parking lights, and front and rear side markers. The license plate lamps are also LED.
Interior lighting is listed as LED for the dome, map, glove-box, and trunk lamps. Before ordering a headlight replacement, confirm whether your MKZ has HID or LED headlamps, since that determines whether the listed headlight fitment is D3S or LED.